Projecting-screen.



w. K. HILL.

PROJECTING SCREEN.

APPLICATION FILED NOV. 18. I916.

Patented Feb. 4, 1919.-

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mo snare Parana op nion.

TAM K. HILL, SAN FRANCISCO, CALIFORNIA.

" PROJEGTINGr-SCREEN.

Specification of Letters Patent.

Patented Feb. 43-, 191L2 1).

Application filed November 18, 1916. Serial Ito. 132,034.

provide a. projecting screen, the surface of which is covered with a crystalline material; said material being so positioned and placed that myriads of small angularly positioned reflected surfaces are formed, each of which are adapted to disperse and reflect the light rays over a wide angle without distorting or in any way impairing the clearness or outline of the picture or the image projection. Further objects will hereinafter appear.

The invention consists of the parts, and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the ing drawings, in which-;-

Figure 1 is a front view of the screen partly broken away. 4

Fig. 2 is an enlarged section on line 2-2,

fieferring to the drawings in detail, A in dicates in general the image-displaying surface of the screen. This is formed and constructed in the following manner Referring to Figs. 1 and 2, B indicates the screen proper. This may be constructed of wood, metal or fabric and the crystalline mate'- rial with which .the image-displaying surface is coated, isapplied in the following manner:

A sizing or filling coat, a' fabric screen is used, is coating consists of white resinaceous soap, one alum, one part. These individual ingredients are first mixed with water and brought to a boiling point; The soa mixture is articularly where rst applied. This glue, one part, a

thenadded to the glue, after w ich the alum mixture is added to the already mixed soap and glue. The sizing as a whole is then strained and applied screen having previously been secured and stretched upon a frame. A coat of paint,

known as coat No. '1, is then applied to the accompanyrial rialand may be -to fill part, ,and powdered;

whlte is employed it while hot, the fabric sizing coat after this has become thoroughly dried. Paint coat No. 1 consists of White lead, linseed oil and turpentine, to which is added'a small amount of ivory black. The amount of black employed being just sufficient to give the mixture a slightgrayish color or tint. These ingredients are thoroughly mixed and applied to the sizing coat by a brush or any other suitable ineans, and permitted to thoroughly dry. A second coat of paint, consisting of the same mixture, with the exception that the black is reduced by fifty per cent, is then applied to, the first coat of paint and ermitted to dry. A third coat of paint is t en applied, this coat consisting of the same ingredients as coat No. 1, with the exception that black is entirely omitted;the amount of turpentine employed being increased to such an extent that an egg shell gloss is obtained when the coat dries. The fourth and fifth coat of paint is next applied. These coats consist of the same ingredients as No. 3, with the exception that white zinc is added up to 25% of the white lead employed. The fabric screen has now received one sizing coat and five individual coats of paint, and

his coat isvery slow hesive that practically will become thoroughly attached thereto when the coat finally dries. The crystalline covering material, formin'gthe most important feature of the present invention, is therefore applied to this coat. This mate.- glass, quartz or any other crystalline mateapplied by sprinkling, air blast or otherwise. A final finishing coat is then applied on top ofthe crystal covering the intercesses. This while the adhesive sizing isstill in a sticky condition, and while whitezinc or flake is obvious that any may be used. The white zinc other material may COIISISt of glass crystals crushed coat is applied 1 .to produce a china gloss or enamel finish.

or flake white is preferably sprayed on in the form of a dry powder and any superfluous amount that may be applied can be dusted or burnished ofi the surface of the screen when the adhesive thoroughly dried.

he'screen construction as shown. and deion coat has become jected upon a cloth or painted screen such as commonly used. This has not only been demonstrated in actual practice," but can also be explained from the theoretical point of view, for the following reason. The

' myriad of small reflecting faces produced fied in the sizing coat by the crystalline covering or coating has individual reflecting members whose faces all assume varying angles; Each ray of light striking the screen will therefore be directly reflected from the screen and not diffused and refracted as is otherwise the case. The numerous angles which the crystalline faces produce permits the light rays or image pro ected upon the screen to be viewed from a wide angle without distortion. This is also true from a close point, as eye strain is practically eliminated.

The present screen comprises all the good qualities of the ordinary white and metallic screen, but it eliminates the veil or fog efl'ect peculiar to a metallic screen and at the same time supplies illumination that is absent in the white screen.

While specific ingredients have been speci and in the several painting coats applied, it is obvious that tions, and while crushed glass is preferably employed, it is obvious that anylsimilar material may be used. The materials and finish of the several parts of the screen may to, plural coatings of gressively in their degrees of whiteness with aeaaee otherwise be such as experience and judgment of the'manuic'acturer may dictate.

Having thus described my invention what I claim and desire to secure by Letters Patent is 1. A projectin ric backing, a filli screen comprising a fabng coating applied therepaint varying prothe last coating having the highest degree of whiteness, an adhesive coating applied to the last coating of paint, a covering of crystals applied to the adhesive coating, and a white powder-like filler also applied to the adhesive coating between the crystals.

2. A projecting screen comprising a backing, an adhesive coating, a crystalline reflective covering applied to the coating, and a white powder-like filler applied to the coating between the parts composing the crystalline covering. i

3. A projecting screen havin a crystalline covering, and a filler applied to said crystalline covering to fill the interstices therebetween and to impart a white finish to the screen.

4. A projectin line covering, an applied thereto.

In testimony whereof I have hereunto set screen having a crystala powder-like white filler my hand in the presence, of two'subscribing witnesses. these may be varied to suit different condi- WILLIAM K. HILL.

Witnesses:

JOHN H.'HERRING, W. W. HEALEY. 

